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A method for setting standards for (nitrogen)deposition on natural vegetations in the Netherlands, using the Decision Support System Nature Planner

Een Normstellingsmethode voor (stikstof)depositie op natuurlijke vegetaties in Nederland. Een uitwerking van de Natuurplanner voor natuurdoeltypen

Synopsis

Acidification, eutrophication and desiccation are the most important threats to (semi-)natural ecosystems in the Netherlands. In order to evaluate the magnitude of these threats the RIVM has, in close co-operation with the Winand Staring Centre (SC-DLO), conducted a study to develop a multistress model for terrestrial ecosystems (SMART/MOVE), consisting of a soil model (SMART) and a vegetation model (MOVE). The aim was to develop a method for calculating critical atmospheric deposition levels using SMART/MOVE. This new method can be used to evaluate the critical deposition loads of air-borne nitrogen and acid for several types of terrestrial ecosystems. Some preliminary results have been compared with empirically determined critical loads and values obtained from other models. Although the results of the different methods were quite similar, the critical values for several specific ecosystems differed. The advantage of the new method is the large number of different ecosystems that can be evaluated using a similar standardised method of calculation. Some of the results obtained during the process of calculating the critical deposition loads can also be used to improve SMART/MOVE. Both the results and their use in validating, calibrating and improving SMART/MOVE are described in this report.
 

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